<template>
  <el-container class="home-container">
    <!-- 头部区 -->
    <el-header>
      <div>
        <img src="../assets/logo.png" alt="" />
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
				<!-- 折叠按钮条 -->
				<div class="toggle-button" @click="toggleCollapse">|||</div>
				<!-- 侧边栏菜单区域 -->
        <el-menu
          background-color="#333744"
          text-color="#fff"
          active-text-color="#409EFF"
					unique-opened
					:collapse="isCollapse"
					:collapse-transition="false"
					:router="true"
					:default-active="activepath">
					<!-- 一级菜单 -->
          <el-submenu :index="item.id + ''" :key="item.id" v-for="item in menulist">
						<!-- 一级菜单的模板区域 -->
            <template slot="title">
							<!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <span>{{ item.authName }}</span>
            </template>
						<!-- 二级菜单 -->
            <el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/' + subItem.path)">
							<template slot="title">
							<!-- 图标 -->
              <i class="el-icon-menu"></i>
              <span>{{ subItem.authName }}</span>
            </template>
						</el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 内容主体 -->
      <el-main>
				<!-- welcome的路由占位符 -->
				<router-view></router-view>
			</el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
	data() {
		return {
			menulist: [],
			iconsObj: {
				'125': 'iconfont icon-user',
				'103': 'iconfont icon-tijikongjian',
				'101': 'iconfont icon-shangpin',
				'102': 'iconfont icon-danju',
				'145': 'iconfont icon-baobiao'
			},
			isCollapse: false,
			// 被激活的链接地址
			activepath: ''
		}
	},
	// 生命周期
	created() {
		this.getMenuList()
		this.activepath = window.sessionStorage.getItem('activePath')
	},
  methods: {
    logout() {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
		// 获取左侧左右菜单
		async getMenuList() {
			const {data: res} = await this.$http.get('menus')
			if(res.meta.status !== 200) return this.$message.error(res.meta.msg)
			this.menulist = res.data
			// console.log(res);
		},
		// 点击按钮切换折叠与展开
		toggleCollapse() {
			this.isCollapse = !this.isCollapse
		},
		// 保存链接的激活状态
		saveNavState(activepath) {
			window.sessionStorage.setItem('activePath', activepath)
			this.activepath = activepath
		}
  },
}
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}
.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  img {
    width: 55px;
    height: 55px;
  }
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}
.el-aside {
  background: #333744;
	.el-menu {
		border-right: none;
	}
}
.el-main {
  background-color: #eaedf1;
}
.iconfont {
	margin-right: 10px;
}
.toggle-button {
	background-color: #4a5064;
	color: #fff;
	font-size: 10px;
	line-height: 24px;
	text-align: center;
	letter-spacing: 0.3em;
	cursor: pointer;
}
</style>
